this.workbox = this.workbox || {}; this.workbox.navigationPreload = (function (exports, logger_js) {

'use strict';
try {
  self['workbox:navigation-preload:5.1.4'] && _();
} catch (e) {}
/*
  Copyright 2018 Google LLC
  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * @return {boolean} Whether or not the current browser supports enabling
 * navigation preload.
 *
 * @memberof module:workbox-navigation-preload
 */
function isSupported() {
  return Boolean(self.registration && self.registration.navigationPreload);
}
/*
  Copyright 2018 Google LLC
  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * If the browser supports Navigation Preload, then this will disable it.
 *
 * @memberof module:workbox-navigation-preload
 */
function disable() {
  if (isSupported()) {
    self.addEventListener('activate', event => {
      event.waitUntil(self.registration.navigationPreload.disable().then(() => {
        {
          logger_js.logger.log(`Navigation preload is disabled.`);
        }
      }));
    });
  } else {
    {
      logger_js.logger.log(`Navigation preload is not supported in this browser.`);
    }
  }
}
/*
  Copyright 2018 Google LLC
  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * If the browser supports Navigation Preload, then this will enable it.
 *
 * @param {string} [headerValue] Optionally, allows developers to
 * [override](https://developers.google.com/web/updates/2017/02/navigation-preload#changing_the_header)
 * the value of the `Service-Worker-Navigation-Preload` header which will be
 * sent to the server when making the navigation request.
 *
 * @memberof module:workbox-navigation-preload
 */
function enable(headerValue) {
  if (isSupported()) {
    self.addEventListener('activate', event => {
      event.waitUntil(self.registration.navigationPreload.enable().then(() => {
        // Defaults to Service-Worker-Navigation-Preload: true if not set.
        if (headerValue) {
          self.registration.navigationPreload.setHeaderValue(headerValue);
        }
        {
          logger_js.logger.log(`Navigation preload is enabled.`);
        }
      }));
    });
  } else {
    {
      logger_js.logger.log(`Navigation preload is not supported in this browser.`);
    }
  }
}
exports.disable = disable;
exports.enable = enable;
exports.isSupported = isSupported;
return exports;

}({}, workbox.core._private)); //# sourceMappingURL=workbox-navigation-preload.dev.js.map